python for enumerate

', ' name '), (' Qiwsir.github.io ', ' site ')] >>> dict (temp) #这是函数dict () function to convert the above list to dictionary{' Python ': ' Lang ', ' Qiwsir.github.io ': ' Site ', ' qiwsir ': ' Name '} At this point, do you understand the relationship between the zip () and the loop? With it you can make some loops simpler. In particular, when reading a database with Python (such as MySQL), the function o

Python iterator and generator instance details, python Generator This article describes the python iterator and generator with examples, as shown below: 1. iterator Overview:An iterator is a way to access collection elements. The iterator object is accessed from the first element of the set until all elements are accessed. The iterator can only move forward witho

represent the set of loop entries.The iterator object has a next () method, and the next entry is returned after the method is called. A StopIteration exception is thrown after iteration to tell the program that the loop ends. For calls next () internally and captures exceptions. The range () built-in functions are described in detail in the previous blog article Python basic usage (2. I will not repeat it here Xrange ()Xrange () is similar to range

, physicians, sales, administrators, and civil servants will be flocking to the Python and AI tides with industry knowledge and data resources in their respective fields. Profoundly change the overall landscape of IT, or the DT (data technology) industry. Why does Python come from behind? In general, I can enumerate some of the advantages of

whether an element exists in a group of elements. The complexity of the list algorithm is O (n), and the complexity of the set algorithm is O (1 ). Is set always better than list? In other cases, which data structure should be used? The official Python Wiki provides a document dedicated to the time complexity of various data structure operations for your reference. It is more important to see this document than the answer. Only the

the existence of the Gil. A compromise solution to this problem is discussed in more detail later in the Threads and Processes section. Of course, Python also has some other small shortcomings, in this does not enumerate, I want to say that any language is not perfect, have good and not good at doing things, it is recommended that you do not take a language disadvantage to the advantage of another lan

Python learning notes-day3-python keywords, python-day3-python 1. and logic and 2. assert checks whether a condition is true. If it is false, an error is thrown. 3. The break jumps out of the for and while loop. 4. class definition 5. continue jumps out of this loop and executes the next loop. 6. def Defined Functions

Python basic question type 1: python basic question type I. Two ways to execute Python scripts Ii. Brief the relationship between bit and byte 1 Byte = 8bit Iii. Relationship between ascii, unicode, UTF-8, and gbk Ascii is the first English encoding method in the United States. Gbk is an extension of ascii Chinese characters. As long as the first character is gre

data structure operations for your reference. It is more important to see this document than the answer. Only the Python source code can tell us why.Variable Vulnerability Beginners tend to consider some premise that should not be assumed, and some abnormal procedures are not considered weekly. Lignos also provides an example: for idx, value in enumerate(y): if value > max_value: breakprocessList

= 0 or flase and 1What is the difference between ASCII,Unicode,utf-8,gbk ?14. What is the difference between bytecode and machine code?15. Ternary operation rules and application scenarios?16. List the differences between Python2 and Python3 ?17. Use a single line of code for numeric exchange:? A = 1? B = 2What is the difference between int and long in Python3 and Python2 ?What is the difference between xrange and range ?20. File operation: The difference betweenxreadlines and readlines ?21.